Systems And Methods For Accessing Memory Devices Using Virtual Memory Ranks

A method for accessing memory devices in a memory system, the method comprising:

• grouping a first memory device in a first set of memory devices and a second memory device in a second set of memory devices into a first virtual memory rank using a memory controller circuit system based on eye margins of first data signals sampled by the first and the second memory devices;
• grouping a third memory device in the first set of memory devices and a fourth memory device in the second set of memory devices into a second virtual memory rank using the memory controller circuit system based on eye margins of second data signals sampled by the third and the fourth memory devices;
• accessing the first and the second memory devices in the first virtual memory rank during first memory access operations using the memory controller circuit system;
• and
• accessing the third and the fourth memory devices in the second virtual memory rank during second memory access operations using the memory controller circuit system.

A memory system comprising:

• first and second memory devices in a first stack;
• third and fourth memory devices in a second stack;
• and
• a memory controller circuit system that provides first command signals to the first and the second memory devices and second command signals to the third and the fourth memory devices through the first stack,
• wherein the memory controller circuit system adjusts delays of first identification signals that identify the first and the second memory devices with respect to the first command signals to compensate for skew in the first command signals, and wherein the memory controller circuit system adjusts delays of second identification signals that identify the third and the fourth memory devices with respect to the second command signals to compensate for skew in the second command signals.